You'll want to check the product description for information on what comes with a particular kit, but generally speaking, a vape kit will always come with everything you need to get started, minus the E-Liquid. These will need to be purchased separately.
All vape kits in our shop will come with a device, a tank or pod, and one or more coils, depending on the model. You may sometimes need to purchase a charging cable separately, but this will be clearly outlined in the product description.
Some of the more advanced vape kits we carry do not have built-in batteries and may require you to purchase one or two vape batteries separately, but this will be noted in the product description.